PHOTOELASTIC INVESTIGATION OF LMSC RESEARCH SUBMARINE HULL.
Technical rept. on Solid Mechanics,
LOCKHEED MISSILES AND SPACE CO PALO ALTO CALIF LOCKHEED PALO ALTO RESEARCH LAB
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The proposed bi-spherical pressure hull design to be used in the LMSC submarine was evaluated utilizing the three-dimensional frozen stress photoelastic technique. This evaluation was made using two plastic models, a bi-spherical hull model and a spherical shell model with hatch configurations. The models were subjected to external pressure loading and a programmed thermal cycle to freeze photoelastic stress patterns into the models. The models were then sliced, and stress distributions determined by photoelastic analysis of the slices. The photoelastic results indicated the higher bending stresses in the models than predicted by an analytical solution. The differences between analytical and photoelastic results were attributed to imperfect model geometry. Therefore, attention should be given to geometric parameters in the fabrication of the full scale submarine hull.